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Calabi–Yau Quotients of Hyperkähler Four-folds
Published online by Cambridge University Press: 15 February 2019
Abstract
The aim of this paper is to construct Calabi–Yau 4-folds as crepant resolutions of the quotients of a hyperkähler 4-fold $X$ by a non-symplectic involution
$\unicode[STIX]{x1D6FC}$. We first compute the Hodge numbers of a Calabi–Yau constructed in this way in a general setting, and then we apply the results to several specific examples of non-symplectic involutions, producing Calabi–Yau 4-folds with different Hodge diamonds. Then we restrict ourselves to the case where
$X$ is the Hilbert scheme of two points on a K3 surface
$S$, and the involution
$\unicode[STIX]{x1D6FC}$ is induced by a non-symplectic involution on the K3 surface. In this case we compare the Calabi–Yau 4-fold
$Y_{S}$, which is the crepant resolution of
$X/\unicode[STIX]{x1D6FC}$, with the Calabi–Yau 4-fold
$Z_{S}$, constructed from
$S$ through the Borcea–Voisin construction. We give several explicit geometrical examples of both these Calabi–Yau 4-folds, describing maps related to interesting linear systems as well as a rational
$2:1$ map from
$Z_{S}$ to
$Y_{S}$.
Keywords
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- © Canadian Mathematical Society 2018
Footnotes
Author A. G. was partially supported by PRIN 2010-2011: “Geometria delle Varietà Algebriche” and FIRB 2012 “Moduli spaces and their applications”. Author G. M. was supported by FIRB 2012 “Moduli spaces and their applications”.
References
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